ive recently had a new ideal isar he35 fitted, the user instructions
say 'set the boiler thermostat to maximum and switch on' my question
is what would be the most economical way to run this type of boiler? i
presume on the maximum setting the boiler throws the heat out until
the room thermostat switches it off, if however the boiler thermostat
is set to a mid position would the boiler switch itself on and off
until the room thermostat was satisfied? if this is correct which
method would be most economical in terms of gas usage and boiler wear
and tear

thanks in advance

andyd

On 18 Oct 2004 21:05:27 -0700, (andyd) wrote:

ive recently had a new ideal isar he35 fitted, the user instructions
say 'set the boiler thermostat to maximum and switch on' my question
is what would be the most economical way to run this type of boiler? i
presume on the maximum setting the boiler throws the heat out until
the room thermostat switches it off, if however the boiler thermostat
is set to a mid position would the boiler switch itself on and off
until the room thermostat was satisfied? if this is correct which
method would be most economical in terms of gas usage and boiler wear
and tear

thanks in advance

andyd

This is a modulating, condensing boiler and will operate at its
maximum efficiency at lower temperatures. However, if you are
connecting it to an existing set of radiators which were designed for
a conventional boiler temperature of 82 degrees, then in very cold
weather, you may need to have the boiler running at this temperature.

The Isar boiler will automatically set its own temperature and gas
burn rate to match the heat requirement for the house, while trying to
run at the lowest temperature. Therefore it's reasonable to set the
thermostat high and let it do its own thing.




..andy

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ive recently had a new ideal isar he35 fitted, the user instructions
say 'set the boiler thermostat to maximum and switch on' my question
is what would be the most economical way to run this type of boiler?

The most efficient is to set the boiler thermostat at the lowest setting
consistent with also heating the house adequetely. You may find this
requires it to be bumped up in particularly cold weather. Depending on the
complexities of the heating control systems, the boiler may decide to turn
the temperature down automatically for efficiency purposes.

This only applies to condensing combi boilers.

Non-combi boilers require hotter water to heat the hot water cylinder, so
can't be run much below 70C in most cases. Non-condensing boilers will also
be more efficient at low temperatures, but with the side effect that they
might start condensing and rot away in a few months, so it is recommended to
maintain high temperatures.

Christian.

The most efficient is to set the boiler thermostat at the lowest setting
consistent with also heating the house adequetely.

I forgot to say, that doing so also has a safety benefit. Traditional
radiators had a peak temperature of 82C. Using the method above, in normal
weather so that the dial can be right down, you may find 60C or even 50C to
be acceptable, which is far less likely to scald a child.

Christian.

In an earlier contribution to this discussion,
andyd wrote:

ive recently had a new ideal isar he35 fitted, the user instructions
say 'set the boiler thermostat to maximum and switch on' my question
is what would be the most economical way to run this type of boiler? i
presume on the maximum setting the boiler throws the heat out until
the room thermostat switches it off, if however the boiler thermostat
is set to a mid position would the boiler switch itself on and off
until the room thermostat was satisfied? if this is correct which
method would be most economical in terms of gas usage and boiler wear
and tear

thanks in advance

andyd

Even at the maximum setting, it is still a thermostat and will switch off
when the set - albeit high - temperature is reached. It *doesn't* become a
permanently on switch, as implied by the question!
--
Cheers,
Set Square
______
Please reply to newsgroup. Reply address is invalid.

"Set Square" wrote in message ...
In an earlier contribution to this discussion,
andyd wrote:



andyd

Even at the maximum setting, it is still a thermostat and will switch off
when the set - albeit high - temperature is reached. It *doesn't* become a
permanently on switch, as implied by the question!



sorry i wasnt trying to imply that the thermostat would become a
permanently on switch, however with my he35 controlled by a sunvic
programmable room thermostat set at 20C and the boiler thermostat set
at maximum the boiler operates until the room thermostat switches it
off, when the boiler thermostat is set at the midway position the
boiler switches on and off until the room thermostat is satisfied, the
question was only regarding the most economical way to run the boiler

thanks
andyd

On Tue, 19 Oct 2004 09:50:44 +0100, "Christian McArdle"
wrote:

ive recently had a new ideal isar he35 fitted, the user instructions
say 'set the boiler thermostat to maximum and switch on' my question
is what would be the most economical way to run this type of boiler?

The most efficient is to set the boiler thermostat at the lowest setting
consistent with also heating the house adequetely. You may find this
requires it to be bumped up in particularly cold weather. Depending on the
complexities of the heating control systems, the boiler may decide to turn
the temperature down automatically for efficiency purposes.

This only applies to condensing combi boilers.

I was going to ask the same question re my own combi boiler, but I'm
not sure if it's a "condensing" combi boiler. (I've never heard that
term before. It's a Brittony 80 by Chaffateaux. Is that a CCB?
Thanks
Dave L

On Wed, 20 Oct 2004 16:54:56 GMT, (Dave£) wrote:

On Tue, 19 Oct 2004 09:50:44 +0100, "Christian McArdle"
wrote:

ive recently had a new ideal isar he35 fitted, the user instructions
say 'set the boiler thermostat to maximum and switch on' my question
is what would be the most economical way to run this type of boiler?

The most efficient is to set the boiler thermostat at the lowest setting
consistent with also heating the house adequetely. You may find this
requires it to be bumped up in particularly cold weather. Depending on the
complexities of the heating control systems, the boiler may decide to turn
the temperature down automatically for efficiency purposes.

This only applies to condensing combi boilers.

I was going to ask the same question re my own combi boiler, but I'm
not sure if it's a "condensing" combi boiler. (I've never heard that
term before. It's a Brittony 80 by Chaffateaux. Is that a CCB?
Thanks
Dave L



It's non-condensing


..andy

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